Synthesis and characterization of Cu doped NiO nanoparticles (original) (raw)
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Structural and Optical Properties of Ni and Zn co-doped Copper Oxide nanoparticles
Ni doping in CuO showed successful replacement of Cu+2 ions by Ni+2 ions. Evidence of strain being developed due to doping was seen. Change in crystallite size was observed depending upon the role of Ni as a nucleating center. Intensity variations in absorption and emission spectra were observed which were related to the amount of defects or formation of new phases in the materials. A wide absorption window was observed due to exciton. A change in band gap was observed corresponding to the change in particle size. Zn doping in CuO caused a variation in crystallite size and incorporated defects which had effect on the optical properties. A change in band gap due to defect generated energy levels as well as quantum size effect was seen.
Synthesis of zinc-doped copper oxide nanoparticles: Structural and morphological characterizations
Reported here is the various levels of Zn incorporated CuO nanocrystals derived from a simple chemical precipitation method. The prepared nanocrystals were studied for structural, functional and morphological analysis. The X-ray Diffraction (XRD) analysis of the prepared nanocrystals revealed the monoclinic crystal structure with the sizes in the range between 18 and 25 nm. The Fourier Transform Infrared Spectroscopy (FT-IR) of the prepared nanocrystals was recorded in the range of 4000-400 cm-1 and its further supporting the formation of CuO nanocrystals. The morphology of the prepared products analyzed with Field Emission-Scanning Electron Microscopy (FE-SEM) and the results revealed the synthesized nanocrystals are well distributed and flaky nature in morphology.
Preparation and study of Sn-doped CuO nanoparticles as semiconductor
Journal of Applied Chemistry, 2013
This paper reports the effect of Sn doping on structural and optical properties of CuO nanoparticles prepared by the simple hydrothermal method in mild condition without pH adjustment and surfactant. The structural and optical properties of these CuO and Sn doped CuO particles were investigated using X-ray powder diffraction (XRD), Scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR) and photoluminescence spectroscopy (PL). powder X-ray analysis reveals that Sn +4 ion have substituted the Cu +2 ions without changing the monoclinic structure of CuO but the average particle size of nano CuO increases from 16 nm to 22 nm.The PL emission spectra revealed blue shift after introducing Sn into the CuO and an intensity decreasing as well.
Facile synthesis of Cu/N co-doped TiO2 nanoparticles and their optical and electrical properties
Indian Journal of Physics, 2018
In the present work, pure and copper/nitrogen (Cu/N) co-doped TiO 2 nanoparticles (NPs) with various Cu concentrations have been synthesized via sol-gel route. The optical and electrical properties of the prepared pure and Cu/ N-doped TiO 2 NPs have been assessed by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), energydispersive X-ray spectroscopy (EDX), scanning electron microscope, Brunauer, Emmett and Teller method and UV-Vis spectroscopy. The results show that the addition of suitable amounts of Cu and N content in TiO 2 can alter its optical and electrical properties by extending absorption in the visible region and band gap reduction. XPS and XRD measurements suggest that some of the Ti sites are replaced by Cu atoms, while O sites are occupied by N atoms. An adequate addition of Cu/N in TiO 2 could lead to smaller particle size, higher specific surface area, increased dye adsorption and retarded charge carrier recombination. An optimized 0.3 mol% Cu/N-doped sample shows a significant change in band gap value of TiO 2 from 3.2 to 2.78 eV, enabling it to respond in the visible region. Hence, it can be used as a suitable alternative nanomaterial for dye-sensitized solar cell photoanode application and for photocatalysis operation as well.
Synthesis and optical characterization of copper oxide nanoparticles
Copper oxide (CuO) nanoparticles are synthesized by aqueous precipitation method using copper acetate as a precursor and NaOH as a stabilizing agent. This gives a large scale production of CuO nanoparticles easily. X-ray diffraction pattern (XRD) reveals single phase monoclinic structure. Scanning electron microscopy (SEM) showed the rectangular morphology of as prepared CuO nanoparticles. The transmission electron microscopy (TEM) showed 5-6 nm size of as prepared CuO nanoparticles. Photoluminescence (PL) showed band edge emission at 398 nm and green emission at 527 nm. The band edge-absorption peak is found to be at 355 nm.
Synthesis and Characterization of Copper Oxide Doped with Titanium Nanoparticles
International Journal of Technical Research & Science
Copper oxide (CuO) is a suitable material for the application of photovoltaic where the role of lattice defects is remarkable for shaping its other physical and optical properties. In the present study, we report the structural properties of Ti doped copper oxide (CuO: Ti) (with x=0, 0.0078, 0.0156, 0.0234, 0.0312) nanostructures prepared by sol-gel method. The electrical property of CuO nanoparticles changes with changing the concentration of Ti dopant. The resistivity of undoped CuO is higher than the Ti doped CuO. The XRD (X-ray diffraction) pattern results the formation of pure phase of CuO for x=0 and no impurity phase is observed at 450 o C and 600 o C.
International Journal of Nanomaterials and Biostructures, 2016
Copper oxide (CuO) nanoparticles were synthesized by aqueous solution method using copper acetate as a precursor and NaOH as a stabilizing agent. This gives a large scale production of CuO nanoparticles easily. Characterization of synthesized CuO nanoparticles done by various instrumental techniques such as UV-Vis absorption spectra confirms the thermodynamically stable CuO layers. The fuctional groups identified through the Fouriour Transform Infrared spectroscopy (FTIR) confirms the CuO was capped with Poly Ethylene Glycol (PEG). X-ray diffraction pattern (XRD) reveals single phase monoclinic structure. The average crystalline size of the paerticles found to be 15 nm with debey-Scherrer's formulae. Scanning electron microscopy (SEM) showed the nanocrystals of small sized particles morphology of as prepared CuO nanoparticles. Elemental analysis of CuO nanoparticles done by EDS, which confirms the presence of Cu and oxizen molecules as atomic % is 36.37 and 60.21 respectively. Photoluminescence (PL) showed band edge emission at 398 nm and green emission at 527 nm. The band edge-absorption peak is found to be at 355 nm.
Structural, Optical and Dielectric Properties of Fe Doped CuO Nanoparticles
Undoped and Fe doped CuO nanoparticles were prepared by sol-gel method with different concentration (x=0, 0.1, 0.3%) at 300˚C. The obtained nanoparticles were characterised by XRD, SEM with EDAX spectra, UV-Visible, FL and Dielectric properties. XRD pattern exhibit the presence of cupric oxide (CuO) with monoclinic phase. The observed shift in the absorption edge from 204 to 557 nm with (pure CuO) to 1.0eV (CuO: Fe 1%) and 0.9eV (CuO: Fe 3%). From the FL spectra the peak absorbed at 823nm, the band gap is 1.5eV. The dielectric constant and loss decreases with an increasing frequency at room temperature for pure CuO.
Structural and optical study of Cu-doped TiO2 nanoparticles synthesized by co-precipitation method
Journal of Physics: Conference Series
In this study, we synthesized Cu-doped TiO2 nanoparticles using a coprecipitation method, with chemical TiO2 as the base material and CuSO4.5H2O as a dopant precursor. To characterize their compositional, structural, optical, and paramagnetic properties, we employed energy dispersive X-ray spectroscopy, X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, diffuse reflectance UV-Visible spectroscopy, and electron spin resonance (ESR) spectroscopy. The outcome of the research study showed the samples to have a tetragonal anatase structure with grain sizes of 52-54 nm. The secondary CuO phase in the 6 at.% and 12 at.% samples showed a Cu solubility limit in their TiO2 lattice, which also influences the lattice parameters. We observed band-gap narrowing with an increasing concentration of the Cu dopant, as indicated by the redshift on the reflectance band edge. Substituting Ti with Cu atoms led to the detection of a paramagnetic species by ESR spectroscopy.
Fe doped CuO nanoparticles NLS
Undoped and Fe doped CuO nanoparticles were prepared by sol-gel method with different concentration (x=0, 0.1, 0.3%) at 300°C. The obtained nanoparticles were characterized by XRD, SEM with EDAX spectra, UV-Visible, FL and Dielectric properties. XRD pattern exhibit the presence of cupric oxide (CuO) with monoclinic phase. The observed shift in the absorption edge from 204 to 557 nm with (pure CuO) to 1.0 eV (CuO: Fe 1%) and 0.9 eV (CuO: Fe 3%). From the FL spectra the peak absorbed at 823 nm, the band gap is 1.5 eV. The dielectric constant and loss decreases with an increasing frequency at room temperature for pure CuO.